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spec: If the latter , as you write up notes , you can try leaving a few more " holes " in your narrative , perhaps just telling students to find the information in their text , but also with the possibility to ask them to go off on their own " mid-lecture " to look at an image , listen to a sound file , visit a website , even view a video clip . But to do all this , you require skill which few people specialise in . `` As email becomes just another medium for communication - - rather than something new and exotic - - we become less conscious of its limitations , and we adapt , '' Baron says . `` Thats a philosophical argument that relies on a lack of imagination . Note that the stipple is not adaptive at all . E-mail is the perfect channel for targeted messages and to take advantage of the opportunity . But the middle of the second segment shifts to something different : tasks to complete to prepare for the meeting . During the classic rock & roll era of the 1950s , he sold more records than any artist except Elvis Presley . What excitement , what joy of discovery !